mirror of
https://github.com/phpseclib/phpseclib.git
synced 2024-11-13 17:06:34 +00:00
129 lines
7.1 KiB
PHP
129 lines
7.1 KiB
PHP
<?php
|
|
/**
|
|
* @author Andreas Fischer <bantu@phpbb.com>
|
|
* @copyright MMXIII Andreas Fischer
|
|
* @license http://www.opensource.org/licenses/mit-license.html MIT License
|
|
*/
|
|
|
|
use phpseclib\Crypt\Base;
|
|
use phpseclib\Crypt\RC2;
|
|
|
|
class Unit_Crypt_RC2Test extends PhpseclibTestCase
|
|
{
|
|
var $engines = array(
|
|
Base::ENGINE_INTERNAL => 'internal',
|
|
Base::ENGINE_MCRYPT => 'mcrypt',
|
|
Base::ENGINE_OPENSSL => 'OpenSSL',
|
|
);
|
|
|
|
public function engineVectors()
|
|
{
|
|
// tests from https://tools.ietf.org/html/rfc2268#page-8
|
|
$tests = array(
|
|
// key, effective key length, plaintext, ciphertext
|
|
array('0000000000000000', 63, '0000000000000000', 'ebb773f993278eff'),
|
|
array('ffffffffffffffff', 64, 'ffffffffffffffff', '278b27e42e2f0d49'),
|
|
array('3000000000000000', 64, '1000000000000001', '30649edf9be7d2c2'),
|
|
array('88', 64, '0000000000000000', '61a8a244adacccf0'),
|
|
array('88bca90e90875a', 64, '0000000000000000', '6ccf4308974c267f'),
|
|
array('88bca90e90875a7f0f79c384627bafb2', 64, '0000000000000000', '1a807d272bbe5db1'),
|
|
array('88bca90e90875a7f0f79c384627bafb2', 128, '0000000000000000', '2269552ab0f85ca6'),
|
|
array('88bca90e90875a7f0f79c384627bafb216f80a6f85920584c42fceb0be255daf1e', 129, '0000000000000000', '5b78d3a43dfff1f1')
|
|
);
|
|
|
|
$result = array();
|
|
|
|
foreach ($this->engines as $engine => $engineName) {
|
|
foreach ($tests as $test) {
|
|
$result[] = array($engine, $engineName, $test[0], $test[1], $test[2], $test[3]);
|
|
}
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
// this test is just confirming RC2's key expansion
|
|
public function testEncryptPadding()
|
|
{
|
|
$rc2 = new RC2(Base::MODE_ECB);
|
|
|
|
// unlike Crypt_AES / Crypt_Rijndael, when you tell Crypt_RC2 that the key length is 128-bits the key isn't null padded to that length.
|
|
// instead, RC2 key expansion is used to extend it out to that length. this isn't done for AES / Rijndael since that doesn't define any
|
|
// sort of key expansion algorithm.
|
|
|
|
// admittedly, phpseclib is inconsistent in this regard. RC4 and Blowfish support arbitrary key lengths between a certain range, as well,
|
|
// and they don't have any way to set the key length. but then again, neither do those algorithms have their own key expansion algorithm,
|
|
// whereas RC2 does. and technically, AES / Rijndael (and even Twofish) don't support arbitrary key lengths - they support variable key
|
|
// lengths. so in some ways, i suppose this inconsistency somewhat makes sense, although the fact that Crypt_Twofish doesn't have a
|
|
// setKeyLength() function whereas Crypt_AES / Crypt_Rijndael do not is, itself, an inconsistency.
|
|
|
|
// but that said, Crypt_RC2 is inconsistent in other ways: if you pass a 128-bit (16-byte) key to it via setKey() the key is not treated
|
|
// as a 128-bit key but rather as a 1024-bit key and is expanded accordingly, not via null padding, but via RC2's key expansion algorithm.
|
|
|
|
// this behavior is in contrast to mcrypt, which extends keys via null padding to 1024 bits. it is also in contrast to OpenSSL, which
|
|
// extends keys, via null padding, to 128 bits. mcrypt's approach seems preferable as one can simulate 128 bit keys by using RC2's
|
|
// key expansion algorithm to extend the key to 1024 bits and then changing the first byte of the new key with an inverse pitable mapping.
|
|
// in contrast, to my knowledge, there is no technique for expanding a key less than 128 bits to 128 bits, via RC2 key expansion. the only
|
|
// scenario in that regard is null padding.
|
|
|
|
// simple truncation is insufficient, since, quoting RFC2268, "the purpose of the key-expansion algorithm [in RC2] is to modify the key buffer
|
|
// so that each bit of the expanded key depends in a complicated way on every bit of the supplied input key".
|
|
|
|
// now, to OpenSSL's credit, null padding is internally consistent with OpenSSL. OpenSSL only supports fixed length keys. For rc2, rc4 and
|
|
// bf (blowfish), all keys are 128 bits (or are null padded / truncated accordingly). to use 40-bit or 64-bit keys with RC4 with OpenSSL you
|
|
// don't use the rc4 algorithm - you use the rc4-40 or rc4-64 algorithm. and similarly, it's not aes-cbc that you use - it's either aes-128-cbc
|
|
// or aes-192-cbc or aes-256-cbc. this is in contrast to mcrypt, which (with the exception of RC2) actually supports variable and arbitrary
|
|
// length keys.
|
|
|
|
// superficially, it seens like Rijndael would be another exception to mcrypt's key length handling, but it in fact is not. the reason being that,
|
|
// with mcrypt, when you specify MCRYPT_RIJNDAEL_128 or MCRYPT_RIJNDAEL_192 or MCRYPT_RIJNDAEL_256 the numbers at the end aren't referring to the
|
|
// key length, but rather, the block length. ie. Rijndael, unlike most block ciphers, doesn't just have a variable (but not arbitrary) key length -
|
|
// it also has a variable block length. AES's block length, however, is not variable, so technically, only MCRYPT_RIJNDAEL_128 is AES.
|
|
|
|
$rc2->setKey(str_repeat('d', 16), 128);
|
|
|
|
$rc2->setPreferredEngine(Base::ENGINE_INTERNAL);
|
|
$internal = $rc2->encrypt('d');
|
|
|
|
$result = pack('H*', 'e3b36057f4821346');
|
|
$this->assertEquals($result, $internal, 'Failed asserting that the internal engine produced the correct result');
|
|
|
|
$rc2->setPreferredEngine(Base::ENGINE_MCRYPT);
|
|
if ($rc2->getEngine() == Base::ENGINE_MCRYPT) {
|
|
$mcrypt = $rc2->encrypt('d');
|
|
$this->assertEquals($result, $mcrypt, 'Failed asserting that the mcrypt engine produced the correct result');
|
|
} else {
|
|
self::markTestSkipped('Unable to initialize mcrypt engine');
|
|
}
|
|
|
|
$rc2->setPreferredEngine(Base::ENGINE_OPENSSL);
|
|
if ($rc2->getEngine() == Base::ENGINE_OPENSSL) {
|
|
$openssl = $rc2->encrypt('d');
|
|
$this->assertEquals($result, $openssl, 'Failed asserting that the OpenSSL engine produced the correct result');
|
|
} else {
|
|
self::markTestSkipped('Unable to initialize OpenSSL engine');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dataProvider engineVectors
|
|
*/
|
|
public function testVectors($engine, $engineName, $key, $keyLen, $plaintext, $ciphertext)
|
|
{
|
|
$rc2 = new RC2();
|
|
$rc2->disablePadding();
|
|
$rc2->setKeyLength($keyLen);
|
|
$rc2->setKey(pack('H*', $key)); // could also do $rc2->setKey(pack('H*', $key), $keyLen)
|
|
if (!$rc2->isValidEngine($engine)) {
|
|
self::markTestSkipped('Unable to initialize ' . $engineName . ' engine');
|
|
}
|
|
$rc2->setPreferredEngine($engine);
|
|
|
|
$result = bin2hex($rc2->encrypt(pack('H*', $plaintext)));
|
|
$this->assertEquals($result, $ciphertext, "Failed asserting that $plaintext yielded expected output in $engineName engine");
|
|
|
|
$result = bin2hex($rc2->decrypt(pack('H*', $ciphertext)));
|
|
$this->assertEquals($result, $plaintext, "Failed asserting that decrypted result yielded $plaintext as a result in $engineName engine");
|
|
}
|
|
}
|